单例模式代码
mysql_test.py
from functools import wraps import pymysql def single(cls): """实现类的单例模式""" instance_dict = dict() @wraps(cls) def single_instance(*args,**kwargs): if cls not in instance_dict: instance_dict[cls] = cls(*args,**kwargs) return instance_dict[cls] return single_instance @single class PyMySQLTest(object): def __init__(self,db_name): self.coon = None self.cursor = None self.db_name = db_name try: self.coon = pymysql.connect(host="xx",port=xx,user="xx",password="xx",database=self.db_name,charset="utf8") self.cursor = self.coon.cursor() except Exception as e: raise e def get_all(self): sql = "select cow_number from cow_info where isdelete=0" self.cursor.execute(sql) result = self.cursor.fetchall() print(result)
test_code.py
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_test.PyMySQLTest("cattle") # lock = threading.Lock() def test(): global count print(id(single_instance)) print(" ") single_instance.get_all() if __name__ == '__main__': start_time = time.time() # 创建100个线程链接实例，测试获取数据 for i in range(10): t = Thread(target=test) t.start() end_time = time.time() print(end_time-start_time)
输出结果：
40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 40899976 0.0020003318786621094
报错结果
pymysql.err.OperationalError: (2013, 'Lost connection to MySQL server during query')
错误原因：
一：MySQL持久化链接保持时间为8小时(28800秒），过期后断开连。如果数据库没有新建连接，则会报此错。我这里肯定达不到这个条件 二：因为mysql有一个默认的connect_timeout时间，一旦超过，会自动关闭连接。看看myql和pymysql的文档。# TODO pymysql.err.InternalError: Packet sequence number wrong - got 110 expected 2 错误原因：
一：使用了多线程，多线程共享了同一个数据库连接，但每个execute前没有加上互斥锁 AttributeError: 'NoneType' object has no attribute 'read'
错误原因：不详
给代码加上互斥锁看看情况
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_test.PyMySQLTest("cattle") lock = threading.Lock() def test(l): single_instance.get_all(l) if __name__ == '__main__': start_time = time.time() # 创建100个线程链接实例，测试获取数据 for i in range(10): t = Thread(target=test,args=(lock,)) t.start() end_time = time.time() print(end_time-start_time)
def get_all(self,l): sql = "select cow_number from cow_info where isdelete=0" l.acquire() self.cursor.execute(sql) l.release() result = self.cursor.fetchall() print(result)
输出结果
0.002000093460083008 (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',)) (('1002',), ('1005',), ('2007',), ('3001',), ('3004',), ('868201803000700',), ('868201803000704',), ('868201803000702',), ('868201803000696',), ('868201803000701',), ('868201803000697',), ('868201803000699',), ('868201803000689',), ('868201803000682',), ('868201803000695',), ('868201803000688',), ('868201803000681',), ('868201803000703',), ('868201803000674',), ('868201803000651',), ('180078',), ('180025',), ('130558',), ('160080',), ('160090',), ('170071',), ('170087',), ('170099',), ('170135',), ('150153',), ('160073',), ('170083',), ('150037',), ('150249',), ('160168',), ('160002',), ('170080',), ('140157',), ('160225',), ('140161',), ('140588',), ('160804',), ('140170',), ('160068',), ('16411',), ('160527',), ('180070',), ('180026',), ('180034',), ('180004',), ('1003',), ('130653',), ('160170',), ('180753',), ('180795',), ('180698',), ('180675',), ('20191001',), ('20191002',), ('140680',), ('170058',), ('170159',), ('160059',), ('170095',), ('150092',), ('20200221',), ('20200224',), ('20200226',), ('130739',), ('160169',), ('150641',), ('160829',), ('20200301',), ('2020030111',), ('202003011112',), ('170151',), ('150350',), ('180007',), ('110615',), ('160250',), ('170107',), ('150039',), ('170153',), ('110926',), ('170136',), ('160097',), ('160423',), ('160329',), ('170069',), ('170152',), ('140738',), ('110301',), ('170092',), ('160098',), ('150090',), ('180748',))
然后将线程数量增加到100个，看结果，没问题，200个，300个也没有问题。
连接池代码
class PyMySQLTest(object): def __init__(self,db_name): self.db_name = db_name try: self.pool = PooledDB( creator=pymysql, # 连接对象或者符合DB-API 2的数据库模块 maxconnections=10, # 通常允许的最大连接数，0或None表示任意数量的连接 mincached=5, # 池中空闲连接的数据，值为0表示启动时未建立连接 maxcached=0, # 池中空闲连接的最大数目，即池的大小，0 None两个值表示池大小不受限制 maxshared=3, # 最大共享连接数，0或None表示所有连接都是专用的，当达到此最大数量时，如果请求共享，则共享 blocking=True, # 制定了超过最大连接数量时的行为，如果为True,超过时，阻塞等待连接减少，否则报错 maxusage=None, # 单个连接的最大重用次数，0或None表示无限重用，当达到连接的最大使用次数时，连接将自动重置即关闭连接后再打开 setsession=[], # 可用于准备的sql命令的可选列表会话，例如设置datestyle，设置时区等 ping=0, # 确定何时使用ping进行检测连接，0或者None表示从不检测，1表示从池中获取时检测，2表示创建光标时检测，4表示执行查询时检测，7表示始终检测，args,kwargs：应传递给创建者的参数 host = "xx", port = xx, user = "xx", password = "xx", database = self.db_name, charset = "utf8" ) except Exception as e: raise e def connect(self): self.coon = self.pool.connection() self.cursor = self.coon.cursor(cursor=pymysql.cursors.DictCursor) return self.cursor def get_all(self): cursor = self.connect() sql = "select cow_number from cow_info where isdelete=0" cursor.execute(sql) result = cursor.fetchall() print(result)
from single_pool.test_mysql import mysql_test,mysql_pool_test from threading import Thread import threading import time single_instance = mysql_pool_test.PyMySQLTest("cattle") def test(): single_instance.get_all() if __name__ == '__main__': start_time = time.time() # 创建100个线程链接实例，测试获取数据 for i in range(10): t = Thread(target=test) t.start() end_time = time.time() print(end_time-start_time)
输出结果
E:pythonpython.exe F:/pycharm测试功能文件夹/single_pool/test_code.py 0.002000093460083008 Exception in thread Thread-1: Traceback (most recent call last): File "E:pythonlib hreading.py", line 926, in _bootstrap_inner self.run() File "E:pythonlib hreading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm测试功能文件夹/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:pycharm测试功能文件夹single_pool est_mysqlmysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:pythonlibsite-packagesDBUtilsSteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:pythonlibsite-packagespymysqlcursors.py", line 170, in execute result = self._query(query) File "E:pythonlibsite-packagespymysqlcursors.py", line 328, in _query conn.query(q) File "E:pythonlibsite-packagespymysqlconnections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "E:pythonlibsite-packagespymysqlconnections.py", line 732, in _read_query_result result.read() File "E:pythonlibsite-packagespymysqlconnections.py", line 1075, in read first_packet = self.connection._read_packet() File "E:pythonlibsite-packagespymysqlconnections.py", line 674, in _read_packet recv_data = self._read_bytes(bytes_to_read) File "E:pythonlibsite-packagespymysqlconnections.py", line 691, in _read_bytes data = self._rfile.read(num_bytes) AttributeError: 'NoneType' object has no attribute 'read' [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] Exception in thread Thread-9: Traceback (most recent call last): File "E:pythonlib hreading.py", line 926, in _bootstrap_inner self.run() File "E:pythonlib hreading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm测试功能文件夹/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:pycharm测试功能文件夹single_pool est_mysqlmysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:pythonlibsite-packagesDBUtilsSteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:pythonlibsite-packagespymysqlcursors.py", line 170, in execute result = self._query(query) File "E:pythonlibsite-packagespymysqlcursors.py", line 328, in _query conn.query(q) File "E:pythonlibsite-packagespymysqlconnections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "E:pythonlibsite-packagespymysqlconnections.py", line 732, in _read_query_result result.read() File "E:pythonlibsite-packagespymysqlconnections.py", line 1082, in read self._read_result_packet(first_packet) File "E:pythonlibsite-packagespymysqlconnections.py", line 1152, in _read_result_packet self._read_rowdata_packet() File "E:pythonlibsite-packagespymysqlconnections.py", line 1186, in _read_rowdata_packet packet = self.connection._read_packet() File "E:pythonlibsite-packagespymysqlconnections.py", line 657, in _read_packet packet_header = self._read_bytes(4) File "E:pythonlibsite-packagespymysqlconnections.py", line 691, in _read_bytes data = self._rfile.read(num_bytes) AttributeError: 'NoneType' object has no attribute 'read' Exception in thread Thread-5: Traceback (most recent call last): File "E:pythonlib hreading.py", line 926, in _bootstrap_inner self.run() File "E:pythonlib hreading.py", line 870, in run self._target(*self._args, **self._kwargs) File "F:/pycharm测试功能文件夹/single_pool/test_code.py", line 10, in test single_instance.get_all() File "F:pycharm测试功能文件夹single_pool est_mysqlmysql_pool_test.py", line 47, in get_all cursor.execute(sql) File "E:pythonlibsite-packagesDBUtilsSteadyDB.py", line 605, in tough_method result = method(*args, **kwargs) # try to execute File "E:pythonlibsite-packagespymysqlcursors.py", line 170, in execute result = self._query(query) File "E:pythonlibsite-packagespymysqlcursors.py", line 328, in _query conn.query(q) File "E:pythonlibsite-packagespymysqlconnections.py", line 516, in query self._execute_command(COMMAND.COM_QUERY, sql) File "E:pythonlibsite-packagespymysqlconnections.py", line 750, in _execute_command raise err.InterfaceError("(0, '')") pymysql.err.InterfaceError: (0, '') [{'cow_number': '1002'}, {'cow_number': '1005'}, {'cow_number': '2007'}, {'cow_number': '3001'}, {'cow_number': '3004'}, {'cow_number': '868201803000700'}, {'cow_number': '868201803000704'}, {'cow_number': '868201803000702'}, {'cow_number': '868201803000696'}, {'cow_number': '868201803000701'}, {'cow_number': '868201803000697'}, {'cow_number': '868201803000699'}, {'cow_number': '868201803000689'}, {'cow_number': '868201803000682'}, {'cow_number': '868201803000695'}, {'cow_number': '868201803000688'}, {'cow_number': '868201803000681'}, {'cow_number': '868201803000703'}, {'cow_number': '868201803000674'}, {'cow_number': '868201803000651'}, {'cow_number': '180078'}, {'cow_number': '180025'}, {'cow_number': '130558'}, {'cow_number': '160080'}, {'cow_number': '160090'}, {'cow_number': '170071'}, {'cow_number': '170087'}, {'cow_number': '170099'}, {'cow_number': '170135'}, {'cow_number': '150153'}, {'cow_number': '160073'}, {'cow_number': '170083'}, {'cow_number': '150037'}, {'cow_number': '150249'}, {'cow_number': '160168'}, {'cow_number': '160002'}, {'cow_number': '170080'}, {'cow_number': '140157'}, {'cow_number': '160225'}, {'cow_number': '140161'}, {'cow_number': '140588'}, {'cow_number': '160804'}, {'cow_number': '140170'}, {'cow_number': '160068'}, {'cow_number': '16411'}, {'cow_number': '160527'}, {'cow_number': '180070'}, {'cow_number': '180026'}, {'cow_number': '180034'}, {'cow_number': '180004'}, {'cow_number': '1003'}, {'cow_number': '130653'}, {'cow_number': '160170'}, {'cow_number': '180753'}, {'cow_number': '180795'}, {'cow_number': '180698'}, {'cow_number': '180675'}, {'cow_number': '20191001'}, {'cow_number': '20191002'}, {'cow_number': '140680'}, {'cow_number': '170058'}, {'cow_number': '170159'}, {'cow_number': '160059'}, {'cow_number': '170095'}, {'cow_number': '150092'}, {'cow_number': '20200221'}, {'cow_number': '20200224'}, {'cow_number': '20200226'}, {'cow_number': '130739'}, {'cow_number': '160169'}, {'cow_number': '150641'}, {'cow_number': '160829'}, {'cow_number': '20200301'}, {'cow_number': '2020030111'}, {'cow_number': '202003011112'}, {'cow_number': '170151'}, {'cow_number': '150350'}, {'cow_number': '180007'}, {'cow_number': '110615'}, {'cow_number': '160250'}, {'cow_number': '170107'}, {'cow_number': '150039'}, {'cow_number': '170153'}, {'cow_number': '110926'}, {'cow_number': '170136'}, {'cow_number': '160097'}, {'cow_number': '160423'}, {'cow_number': '160329'}, {'cow_number': '170069'}, {'cow_number': '170152'}, {'cow_number': '140738'}, {'cow_number': '110301'}, {'cow_number': '170092'}, {'cow_number': '160098'}, {'cow_number': '150090'}, {'cow_number': '180748'}] Process finished with exit code 0
# TODO
# 池中空闲连接的初始数目，0表示